Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf1c4efe325dcbe…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 14:18:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e96e476c9fa014358ead74fb8b08182e SHA-1: e709e6df3cf06cb44cb1279ef4caafad62fc0a51 SHA-256: 2bf1c4efe325dcbebcaced9cd8d790db2abf3abfd680cd2ed85fe66972fcf612
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/479516143/minecraft-bedrock-free-download-game-hack PDF link annotation
    • http://daskrimti-jabar.web.id/library/repository/how-to-get-free-robux-getrobux-gg_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/all-free-roblox-2021-face-accessories_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/i-want-to-be-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/how-to-ger-free-robux-with-pastebin_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-exploits-roblox-2021_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/how-to-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/how-to-get-roblox-for-free-on-xbox-one_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/mistplay-hack-robux_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/cheats-coin-master-free_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/roblox-hack-2021-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x340A 21648 bytes
SHA-256: 3b53db89c047d3701590be0ce6b0860dc6833aafa1a8742a27cc1fac80f47b49
font_01_sfnt_off00006373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6373 18964 bytes
SHA-256: 748ffd9e178d60222e66fae921696cfc4ef08c5774789f044573331dfc570242

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